package com.atguigu.NoSafe;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CopyOnWriteArraySet;

public class NoSafe {
    public static void main(String[] args) {
//        List<String> list =new CopyOnWriteArrayList();//Collections.synchronizedList(new ArrayList<>());//new ArrayList();
//        for (int i = 0; i < 100; i++) {
//            new Thread(()->{
//                list.add(UUID.randomUUID().toString().substring(0,6));
//                System.out.println(list);
//            },String.valueOf(i)).start();
//        }
//        Set<String> set =new  CopyOnWriteArraySet();//Collections.synchronizedSet(new HashSet<>());//new HashSet<>();
//        for (int i = 0; i < 100; i++) {
//            new Thread(()->{
//                set.add(UUID.randomUUID().toString().substring(0,6));
//                System.out.println(set);
//            },String.valueOf(i)).start();
//        }
        Map<String,String> map = new ConcurrentHashMap<>();//Collections.synchronizedMap(new HashMap<>()); //new HashMap();
        for (int i = 0; i < 100; i++) {
            new Thread(()->{
                map.put(Thread.currentThread().getName(),UUID.randomUUID().toString().substring(0,6));
                System.out.println(map);
            },String.valueOf(i)).start();

        }
    }
}
